Abstract: The present invention provides a coating film having a structure represented by the following general formula (1) (in the formula, R11 is a residue formed by removing one isocyanate group from a polyisocyanate, and R12 is an alkyl group or an alkoxy group having 2 to 12 carbon atoms, R13 is a residue formed by removing one hydroxyl group from a polyol), wherein a König hardness of the coating film is 20 or more, in an SS curve measurement of a tensile test, the coating film has an elastic deformation region and a plastic deformation region, and in the SS curve measurement, a stress at an inflection point stress between the elastic deformation region and the plastic deformation region is 5 MPa or more.

Abstract: A blocked polyisocyanate composition containing a blocked polyisocyanate obtained from a polyisocyanate and at least one blocking agent, wherein the blocking agent contains a compound represented by general formula (I) shown below, and the amount of methane tetracarbonyl structures represented by general formula (II) shown below, relative to the total molar amount within the blocked polyisocyanate of bonded structures in which the compound represented by general formula (I) is bonded to the polyisocyanate, is at least 0.5 mol % but not more than 10 mol %.

Abstract: A mechanical pencil includes a main body in which a mechanism for discharging a pencil lead is located, and a clip attached to the main body wherein the clip includes a container for storing a refill for a pencil lead.

Abstract: The present invention provides dental fillers having the optical and/or mechanical characteristics required to dental materials, a method of producing the same, and a dental composite material prepared with use of the dental filler. More specifically, the present invention provides a dental filler containing a zirconium silicate compound, especially a zirconium trisilicate compound with a wadeite type crystalline structure and having an average particle diameter in the range from 2 to 50,000 nm, a method of producing the same, a dental composite material containing the dental filler and a hardenable resin selected from an acrylic resin, a methacrylic resin, an epoxy resin, a vinyl resin, a urethane resin and the like.

Abstract: A dental filler having the optical and/or mechanical properties satisfying the requirements to a dental material, a method for producing the dental filler, and a dental composite material containing the dental filler. The dental filler comprises microparticles of amorphous inorganic oxide constituted by at least silica-based fine particles covered with a composite oxide comprising zirconium, silicon and oxygen. The dental composite material contains the dental filler and a hardenable resin selected from an acrylic resin, a methacrylic resin, an epoxy resin, a vinyl resin and a urethane resin.

Abstract: The hard coat layer-forming composition of this invention includes (A) composite oxide fine particles with a mean particle diameter of 1 to 200 nm, containing titanium, tin and optionally silicon, and with a rutile-type crystal structure, (B) an organosilicon compound represented by the formula R1aR2bSi(OR3)4?(a+b) and/or a hydrolyzate thereof, and (C) a cyanamide derivative compound. A hard coat layer formed from the composition not only is excellent in transparency, scratch resistance, adhesion property, weathering resistance, impact resistance, etc. but also can enjoy no coloration or little coloration, particularly in bluing or yellowing, upon exposure to or irradiation with ultraviolet rays, even if an antireflection film is provided.

Abstract: The hard coat layer-forming composition of this invention includes (A) composite oxide fine particles with a mean particle diameter of 1 to 200 nm, containing titanium, tin and optionally silicon, and with a rutile-type crystal structure, (B) an organosilicon compound represented by the formula R1aR2bSi(OR3)4?(a+b) and/or a hydrolyzate thereof, and (C) a cyanamide derivative compound. A hard coat layer formed from the composition not only is excellent in transparency, scratch resistance, adhesion property, weathering resistance, impact resistance, etc. but also can enjoy no coloration or little coloration, particularly in bluing or yellowing, upon exposure to or irradiation with ultraviolet rays, even if an antireflection film is provided.

Abstract: A dental filler having the optical and/or mechanical properties satisfying the requirements to a dental material, a method for producing the dental filler, and a dental composite material containing the dental filler. The dental filler comprises microparticles of amorphous inorganic oxide constituted by at least silica-based fine particles covered with a composite oxide comprising zirconium, silicon and oxygen. The dental composite material contains the dental filler and a hardenable resin selected from an acrylic resin, a methacrylic resin, an epoxy resin, a vinyl resin and a urethane resin.

Abstract: The present invention provides dental fillers having the optical and/or mechanical characteristics required to dental materials, a method of producing the same, and a dental composite material prepared with use of the dental filler. More specifically, the present invention provides a dental filler containing a zirconium silicate compound, especially a zirconium trisilicate compound with a wadeite type crystalline structure and having an average particle diameter in the range from 2 to 50,000 nm, a method of producing the same, a dental composite material containing the dental filler and a hardenable resin selected from an acrylic resin, a methacrylic resin, an epoxy resin, a vinyl resin, a urethane resin and the like.

Abstract: A composite polymer is obtained by reacting (a) an elastomer having a carboxyl group with (b) metal oxide fine particles each having an epoxy ring-containing group on the particle surface. A thermally cured product of the composite polymer is a material favorable for forming a primer layer which has not only high transparency but also excellent adhesion to a hard coat layer and is excellent also in scratch resistance, heat resistance, weathering resistance, dyeing property, impact resistance and the like. An article such as an optical article whose primer layer comprises the thermally cured product of the composite polymer has high transparency and is excellent also in heat resistance.

Abstract: Disclosed herein is a plastic lens which exhibits outstanding weather resistance and light resistance with a minimum of deteriorating effect on the organic antireflection thin film formed thereon. The plastic lens is composed of a plastic lens base material, a hard coating layer formed on the plastic lens base material, and an antireflection film formed on the hard coating layer, wherein the hard coating layer is one which is formed from a coating composition comprising inorganic oxide fine particles containing titanium oxide with a rutile-type crystallite and an organosilicon compound as a binder.

Abstract: A hard coat or a transparent film having excellent adhesion to a polycarbonate substrate is provided. The transparent film-forming coating liquid of the present invention comprises the following components (A) to (D): (A) an organosilicon compound and/or a hydrolyzate of the organosilicon compound, (B) metal oxide fine particles each of which comprises a metal oxide core particle and a coating layer composed of antimony oxide, (C) one or more curing agents (curing agent (A)) selected from the group consisting of a polythiol compound, an organic polycarboxylic acid and an acetylacetone metal complex, and (D) a curing agent (curing agent B) comprising a compound containing basic nitrogen. The metal oxide particles (B) have been surface-modified with an organosilicon compound or an amine compound.

Abstract: A charging device which is pressed against a surface of a body to be charged in a state that a voltage is applied to charge the body, having: an electrically conductive support to which a voltage is applied; an electrically conductive elastic body layer fixed on the electrically conductive support for dispersing electrically conductive particles to regulate resistance and hardness; an electrode layer provided on the electrically conductive elastic body layer, and having an electrically conductive inorganic material; and a resistance regulation layer provided on the electrode layer for regulating resistance.

Abstract: The present invention describes a charging device pressed against the surface of a body to be charged in a state of being applied with a voltage so as to charge the body. The charging device includes an electrically conductive support to which a voltage is to be applied; an electrically conductive elastic body layer fixed on the electrically conductive support; a resistance regulation layer covering the electrically conductive elastic body layer; and a protective layer laminated on the resistance regulation layer, having hardness of 6 H or more in pencil hardness, and made from a silicon compound.

Abstract: A charging device which is pressed against a surface of a body to be charged in a state that a voltage is applied to charge the body, having an electrically conductive support to which a voltage is applied; an electrically conductive elastic body layer fixed on the electrically conductive support for dispersing electrically conductive particles to regulate resistance and hardness; an electrode layer provided on the electrically conductive elastic body layer, and having an electrically conductive inorganic material; and a resistance regulation layer provided on the electrode layer for regulating resistance.